[Gutenberg] Bring in the React Native 0.66 upgrade of gutenberg-mobile

[hypest]

Update gutenberg-mobile to include the upgrade to React Native 0.66.x

Related PRs

• Upgrade to RN 0.66 gutenberg-mobile#4235

To test:

Performed Gutenberg Mobile Writing Flow, UBE, and Sanity test cases.

Regression Notes

1. Potential unintended areas of impact
   Regressions in the block editor from upgrading the foundational third-party dependency utilized.
2. What I did to test those areas of impact (or what existing automated tests I relied on)
   Performed Gutenberg Mobile Writing Flow, UBE, and Sanity test cases.
3. What automated tests I added (or what prevented me from doing so)
   Not really possible or relevant for this type of dependency upgrade work.

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

You can trigger optional UI/connected tests for these changes by visiting CircleCI here.

[peril-wordpress-mobile]

You can test the changes on this Pull Request by downloading the APKs:

• Jetpack-pr-15566-build-118001.apk

• WordPress-pr-15566-build-118001.apk

[hypest]

The currently failing jobs due to Incompatible classes were found in dependencies. Remove them from the classpath or use '-Xskip-metadata-version-check' to suppress errors will be fixed when #15642 lands and we update to it.

[dcalhoun]

The changes in this PR are expectedly minimal. Much of the WPAndroid Writing Flow, Unsupported Block Editor, and additional features were tested against wordpress-mobile/gutenberg-mobile#4235.

LGTM. Before we merge this PR, we need to update the gutenbergMobileVersion reference to a new tag.